code: def test_enterAsyncContext_arg_errors(self):
      class Test(unittest.IsolatedAsyncioTestCase):
          async def test_func(slf):
              with self.assertRaisesRegex(
                  TypeError, "asynchronous context manager"
              ):
                  await slf.enterAsyncContext(LacksEnterAndExit())
              with self.assertRaisesRegex(
                  TypeError, "asynchronous context manager"
              ):
                  await slf.enterAsyncContext(LacksEnter())
              with self.assertRaisesRegex(
                  TypeError, "asynchronous context manager"
              ):
                  await slf.enterAsyncContext(LacksExit())
  
      test = Test("test_func")
      output = test.run()
      self.assertTrue(output.wasSuccessful())
  
imports: import asyncio
  import contextvars
  import unittest
  from test import support
label_desc: Use image node_id 12 for calling the TestAsyncCase obj's underlying member method code with example usage: obj.test_enterAsyncContext_arg_errors() without return types